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Term Definition
abscisic acid

a plant hormone; it reduces growth and sensitivity to antheridiogen in C-Fern gametophytes

allele

one of the alternative forms of a gene that occurs at the same locus

alternation of generations

life cycle alternating between gametophyte and sporophyte

antheridiogen

in ferns, a chemical substance (pheromone) secreted by gametophytes that causes immature gametophytes to develop as males

antheridium (a)

a male sexual organ that produces sperm (spermatozoids); the sperm-producing sex organ of seedless plants, also fungi and algae

archegonial neck

the nipple-shaped external portion of an archegonium, below the base of which the egg is located

archegonium (a)

a female sexual organ that contains a single egg; the egg-producing sex organ of seedless plants - such as ferns and mosses

axenic

in biology, a culture of a particular organism that is entirely free from all other contaminating organisms

buffer

substance which can stabilize the pH of a solution by neutralizing the effects of acids or bases

cell

the fundamental structural unit of living organisms

cell wall

the exterior portion of the plant cell that surrounds the protoplast

chemoattractant

a chemical that can attract motile cells such as sperm

chlorophyll

the green pigment in plant cells used in photosynthesis

chloroplast

a chlorophyll-containing organelle (i.e. plastid) in plants and algae

circinate vernation

the specialized pattern of leaf development that occurs in ferns - in which the leaf unrolls from the fiddlehead

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